No trip to the zoo is complete without a souvenir, but Prague Zoo is giving its patrons a bit more variety than most. The gift shop now features 1-kilo tubs of elephant dung; initially, the product was only available on weekends, but because of its brisk sales, is now for purchase all week long.

It's the latest fad among Czech gardeners who are buying out the manure pails to use as fertilizer. The brain behind the project is zoo director Miroslav Bobek, whose surname literally means dung.

The one-kilo tub of elephant poop goes for about $3.90. The zoo sells 200 or more each week.